TBR Physics Question

[moto_za]

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I was wondering if someone would help me out with question 57 from passage IX from the Equilibrium and Momentum chapter. I am having trouble understanding why the counterweight has to be multiplied by 1 to arrive at the answer. I would greatly appreciate your help.

 

[ElliottB]

You might get more help if you post the actual question for those who don't use the BR books.